First of all, it should be clear that not all toothaches require root canal treatment, and the clinical treatment plan needs to be decided according to the nature of the pain. If you feel toothache when you eat, you may have a decayed tooth, which needs to be removed and then checked. If there is no symptom, it can be filled directly and root canal treatment is not necessarily needed. When the caries is larger and deeper, with spontaneous pain, extreme discomfort without stimulation or unbearable pain, the inflammation may spread to the pulp or even the periapical tissue, root canal treatment must be done in order to preserve the affected tooth. Root canal treatment is currently the most effective way to preserve natural teeth. It is more appropriate to do root canal treatment because it can keep the natural tooth in a complete biological state without removing all the affected teeth, while keeping the alignment of the natural tooth intact with root canal treatment and preventing the displacement of neighboring teeth and tooth decay.